Display Electrode Pattern Layer for Light Extraction and ESD Protection
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Solution Overview
Problem
Display devices face challenges in enhancing light-emitting efficiency and preventing damage from static electricity, particularly in high-temperature environments and in maintaining the longevity of light-emitting elements.
Innovation Solution
A display device design featuring a bank layer with a lattice pattern and slit pattern electrode configuration, where the slit pattern overlaps the emission area and includes scattering members to improve light-emitting efficiency and prevent static electricity damage, utilizing a capping layer and wavelength conversion material to optimize light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional electrode structure is used, then the device structure is simple, but the light-emitting efficiency is insufficient and static electricity damage cannot be prevented
Solution Approach 1:
The electrode structure is segmented into multiple functional patterns: a lattice pattern for static electricity prevention, a slit pattern for light extraction enhancement, and contact regions for electrical connection. This segmentation allows each pattern to perform its specific function optimally while collectively improving light-emitting efficiency without compromising structural integrity.
Solution Approach 2:
The electrode pattern layer serves multiple functions simultaneously: it acts as an electrical conductor, a light extraction enhancement structure, and a static electricity prevention mechanism. The lattice pattern specifically provides electrostatic discharge pathways while the slit pattern enhances light coupling, making the electrode structure multi-functional and resolving the contradiction between simplicity and performance.
2Reliability
If the electrode pattern layer covers the entire emission area, then electrical connection is improved, but light-emitting efficiency decreases due to reduced light extraction
Solution Approach 1:
The electrode pattern layer exhibits local quality variations: in some regions it forms a lattice pattern for electrostatic protection, in other regions it creates slit patterns for light extraction enhancement, and in contact regions it provides electrical connection. This spatial variation in structure and function allows simultaneous optimization of electrical connection reliability and light extraction efficiency without mutual interference.
3Productivity
If scattering members are added to the slit pattern, then light-emitting efficiency is improved, but device complexity increases
Solution Approach 1:
The scattering members are merged with the electrode pattern layer, forming an integrated structure where the electrode patterns and scattering members coexist in the same layer. This merging eliminates the need for separate scattering layers, reduces the number of fabrication steps, and improves light-emitting efficiency through enhanced light extraction while minimizing the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances light-emitting efficiency and protects the display device from static electricity, ensuring improved performance and longevity of the light-emitting elements.
Implementation Method 1
The slit pattern may include a plurality of scattering members spaced apart from one another with slits extended to traverse the emission area therebetween
Implementation Method 2
a wavelength conversion material disposed on an upper surface of the plurality of scattering members to convert a wavelength of light output from the light-emitting elements
Data Source
AI summary
A display device includes a bank layer defining an emission area in which light-emitting elements are disposed, a first electrode and a second electrode that are spaced apart from each other in the emission area, the light-emitting elements being disposed between the first electrode and the second electrode, and an electrode pattern layer disposed above the bank layer, the light-emitting elements, the first electrode and the second electrode. The electrode pattern layer includes a lattice pattern that does not overlap the emission area and that surrounds edges of the emission area, and a slit pattern overlapping the emission area.